<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/denglu"  method="post">
    用户名:<input type="text" name="username" /><br>
    密码:<input type="password"  name="password"/><br>
    <input type="submit"  value="登录"/>
</form>
</body>
</html>